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An Intermittency Model For Predicting Roughness Induced Transition, Xuan Ge, Paul A. Durbin 2017 Iowa State University

An Intermittency Model For Predicting Roughness Induced Transition, Xuan Ge, Paul A. Durbin

Paul A. Durbin

An intermittency transport equation for RANS modeling, formulated in local variables, is extended for roughness-induced transition. To predict roughness effects in the fully turbulent boundary layer, published boundary conditions for k and ω are used. They depend on the equivalent sand-grain roughness height, and account for the effective displacement of wall distance origin. Similarly in our approach, wall distance in the transition model for smooth surfaces is modified by an effective origin, which depends on equivalent sand-grain roughness. Flat plate test cases are computed to show that the proposed model is able to predict transition onset in agreement with a ...


Hybrid Buoyant Aircraft: Future Stol Aircraft For Interconnectivity Of The Malaysian Islands, Anwar ul Haque, Waqar Asrar, Ashraf Ali Omar, Erwin Sulaeman, Jaffar Syed Mohamed Ali 2017 International Islamic University Malaysia (IIUM)

Hybrid Buoyant Aircraft: Future Stol Aircraft For Interconnectivity Of The Malaysian Islands, Anwar Ul Haque, Waqar Asrar, Ashraf Ali Omar, Erwin Sulaeman, Jaffar Syed Mohamed Ali

Journal of Aviation Technology and Engineering

Hybrid buoyant aircraft are new to the arena of air travel. They have the potential to boost the industry by leveraging new emerging lighter-than-air (LTA) and heavier-than-air (HTA) technologies. Hybrid buoyant aircraft are possible substitutes for jet and turbo-propeller aircraft currently utilized in aviation, and this manuscript is a country-specific (Malaysia) analysis to determine their potential market, assessing the tourism, business, agricultural, and airport transfer needs of such vehicles. A political, economic, social, and technological factors (PEST) analysis was also conducted to determine the impact of PEST parameters on the development of buoyant aircraft and to assess all existing problems ...


Literature Review: Biomimetic And Conventional Aircraft Wing Tips, Naseeb Ahmed Siddiqui, Waqar Asrar, Erwin Sulaeman 2017 International Islamic University - Malaysia

Literature Review: Biomimetic And Conventional Aircraft Wing Tips, Naseeb Ahmed Siddiqui, Waqar Asrar, Erwin Sulaeman

International Journal of Aviation, Aeronautics, and Aerospace

This paper is an attempt to summarize the effect of wing tip devices employed by birds, as well as aeronautical engineers in the past to improve the performance characteristics of aircraft. The focus is on reduction of the induced drag or drag due to lift also known as inviscid drag. This paper will provide an insight on both biomimetic and conventional wing tip approaches to reduce the induced drag. Prior analysis and experiments on the aerodynamics of airplane performance due to both these separate studies have been discussed. The needs of the industry and their past inventions have been described ...


Adopting Unmanned Flight Operations Into Controlled Airspace, Jennah C. Perry, Johnny Young, Jacqueline Luedtke, Benjamin Cook, Holly Hughes, Allison M. Little, Kyle Wilkerson 2017 Embry-Riddle Aeronautical University - Prescott

Adopting Unmanned Flight Operations Into Controlled Airspace, Jennah C. Perry, Johnny Young, Jacqueline Luedtke, Benjamin Cook, Holly Hughes, Allison M. Little, Kyle Wilkerson

Publications

Unmanned aircraft activity is becoming more common within the National Airspace System (NAS) and is expected to dominate the NAS in the near future. Specific procedures for adopting unmanned aircraft into the National Airspace System (NAS).

A variation of the Military Grid Reference System was developed and digitally overlaid onto the radar display. To incorporate this grid system, a customized flight plan database was created for the storage of operator submitted flight plans. Instead of verbal communication, a computer chat system is used for communication because of the low altitude operations in the field.

The Federal Aviation Administration (FAA) has ...


Integrating Unmanned Aircraft Operations Into The National Airspace System, Benjamin Cook, Holly Hughes, Kyle Wilkerson, Allison Little 2017 Embry-Riddle Aeronautical University

Integrating Unmanned Aircraft Operations Into The National Airspace System, Benjamin Cook, Holly Hughes, Kyle Wilkerson, Allison Little

Discovery Day - Prescott

Unmanned Aircraft Systems (UAS) are expected to dominate the National Airspace System (NAS) in the near future. One particular barrier preventing the integration of unmanned aircraft into the NAS is the lack of standardized procedures for distinguishing and communicating with remote UAS operators. In preparation for adopting unmanned flight operations into a complex control system, it is important to identify solutions to effectively control UAS in the NAS. To achieve simultaneous safe manned and unmanned aircraft operations in the NAS, the Joint UAS and ATC Team (JUAT) at Embry-Riddle Aeronautical University (ERAU) are developing a system that could be used ...


Combustion Tap-Off Cycle, Nicole Shriver 2016 Embry-Riddle Aeronautical University

Combustion Tap-Off Cycle, Nicole Shriver

College of Engineering

This directed study was done on the combustion tap-off cycle, which is a unique type of rocket engine cycle. The combustion tap-off cycle is not one that is mentioned or discussed in the AE 414 Space Propulsion class. This cycle has only been used by two engines, the J-2S and BE-3. The J-2S was created in the 1960’s by heritage Rocketdyne. This engine has never been flown, but it has been tested extensively. This engine proved that the tap-off cycle was possible for rockets and useful for its throttling capabilities. The BE-3 was developed by Blue Origin for use ...


Assessment Of Asymmetric Flight On Solar Uas, Eric Belfield 2016 California Polytechnic State University, San Luis Obispo

Assessment Of Asymmetric Flight On Solar Uas, Eric Belfield

Master's Theses and Project Reports

An investigation was conducted into the feasibility of using an unconventional flight technique, asymmetric flight, to improve overall efficiency of solar aircraft. In this study, asymmetric flight is defined as steady level flight in a non-wings-level state in- tended to improve solar incidence angle. By manipulating aircraft orientation through roll angle, solar energy collection is improved but aerodynamic efficiency is worsened due to the introduction of additional trim drag. A point performance model was devel- oped to investigate the trade-off between improvement in solar energy collection and additional drag associated with asymmetric flight. A mission model with a focus on ...


Dji S-1000 Spreading Wings Octocopter: Determination Of Rotor Downwash Slipstream Size, Jonathan Lemieux 2016 University of Tennessee, Knoxville

Dji S-1000 Spreading Wings Octocopter: Determination Of Rotor Downwash Slipstream Size, Jonathan Lemieux

Masters Theses

The DJI S-1000 Spreading Wings octocopter rotor downwash slipstream area of influence was measured in axial climb conditions and in straight level flight. These data were gathered using a simple apparatus of distributed anemometers and a custom made boom affixed to the drone. Straight level flight tests incurred autopilot oscillations that rendered the data gathering and analysis challenging. The best quality data was acquired during the axial climb flight tests. The axial climbs were conducted in calm winds. It was determined that the axial climbs under these conditions displaced the rotor slipstream 9 ± 2.5 cm to the rear of ...


2015-2016 Eraudb Aiaa Design/Build/Fly Technical Report, Trevor W. Perrott 2016 Embry-Riddle Aeronautical University

2015-2016 Eraudb Aiaa Design/Build/Fly Technical Report, Trevor W. Perrott

Student Works

The economic potential of small unmanned aerial vehicles (SUAVs) has been well documented and reported. According to the Association for Unmanned Vehicle Systems International (AUVSI), there is an associated economic impact from the growth of the UAV industry. The goal of the American Institute of Aeronautics and Astronautics Design/Build/Fly Competition Research Program (AIAA DBF CRP) is to investigate design and manufacturing methods for application to SUAVs within the scope of the AIAA DBF Competition.

Students were engaged in the application of aerospace engineering knowledge for the production of a dual-aircraft system. Through the use of Computational Fluid Dynamics ...


Development Of A "Multi-Cut" Payload For Use In Stratospheric Ballooning Missions, James Flaten, Joey Habeck, Noah Biniek, Steven Smeaton, Austin Langford, Jordan Diers, Isaac Krieger 2016 U of MN - Twin Cities / MN Space Grant

Development Of A "Multi-Cut" Payload For Use In Stratospheric Ballooning Missions, James Flaten, Joey Habeck, Noah Biniek, Steven Smeaton, Austin Langford, Jordan Diers, Isaac Krieger

2017 Academic High Altitude Conference

The ability to cut strings (AKA lines) during stratospheric ballooning missions has a wide variety of uses including, but not limited to, (a) flight termination (i.e. cutting payloads away from the main balloon), (b) cutting away excess lift balloon(s) to slow ascent rate (and possibly achieve float), (c) cutting away ballast weights to slow descent rate or increase ascent rate, (d) cutting away burst balloon(s) on descent to avoid parachute entanglement, and (e) cutting away payloads which are intended to return to the ground independently, for experimental purposes. We report on the development of a “multi-cut” payload ...


Risk-Based Approach To Assessment Of Advanced Technologies For Conceptual Design, Adipratnia Asmady 2016 California Polytechnic State University - San Luis Obispo

Risk-Based Approach To Assessment Of Advanced Technologies For Conceptual Design, Adipratnia Asmady

Master's Theses and Project Reports

The conceptual design phase of an aerospace system development program is typically characterized by short duration and relatively limited resources, yet design decisions are made that have critical implications on program risk. To address the more aggressive requirements, one of these decisions is the selection of advanced technologies. System developers need to assess advanced technologies early on, but are faced with uncertainties surrounding the potential net benefits. The concept introduced in this study is uncertainty characterization as a way to better understand the associated risk. A framework was developed to guide the interaction between the technology developer and the system ...


Tilt-Rotor Drone, Benjamin Stone, Zachary Crandall 2016 California Polytechnic State University, San Luis Obispo

Tilt-Rotor Drone, Benjamin Stone, Zachary Crandall

Electrical Engineering

A drone is defined a "an unmanned aircraft that can fly autonomously[2]." In the year 2016, there exist many applications for small scale drones. Drones, having had primarily military applications, now have use in hobby robotics, photography, and even in surveying. But drones have not yet been perfected and still have room for much improvement. Several problems with drones come in the form of battery life, stability, and size. Large drones can fit many sensors and probes, but are heavy and have less flight time. For autonomous drones, stability can be an issue even though there exist many stable ...


Uav As A Service: Providing On-Demand Access And On-The-Fly Retasking Of Multi-Tenant Uavs Using Cloud Services, Justin Yapp 2016 Embry-Riddle Aeronautical University

Uav As A Service: Providing On-Demand Access And On-The-Fly Retasking Of Multi-Tenant Uavs Using Cloud Services, Justin Yapp

Dissertations and Theses

As commercial roles for Unmanned Aerial Vehicles (UAVs) become more well-defined and demand for the services provided by them increases, UAVs rely more on new cloud computing services and co-operative coordination to provide mission planning, control, tracking and data processing. We present UAV as a Service (UAVaaS) framework, which brings features commonly found in traditional cloud services, such as Infrastructure, Platform, and Software as a Service, to the domain of UAVs. Our work aims to conceptualize and design UAVaaS for commercial applications. Specifically, a cloud-provided orchestration framework that allows multi-tenant UAVs to easily serve multiple heterogenous clients at once and ...


Evaluation Of The Transmission Of Space Solar Power To Uavs By Microwave Transmission, Alexander Holland, Wilson Lysford, Jens Pearson, Jeremy Straub 2016 Selected Works

Evaluation Of The Transmission Of Space Solar Power To Uavs By Microwave Transmission, Alexander Holland, Wilson Lysford, Jens Pearson, Jeremy Straub

Jeremy Straub

The purpose of this poster is to explore the pos-sibility of the transmission of power from a space based solar power satellite to UAVs via microwave radiation. The type of system that will collect and transmit the solar power will be discussed and the economics of the solution will be considered. The frequency of transmission, area, and the free space loss will be considered to determine the effective-ness of the system. The UAV power-consumer craft will also be discussed


2d Aeroacoustic Analysis Of Flow In The Flame Trench, Meghan Pokorski 2016 Embry-Riddle Aeronautical University

2d Aeroacoustic Analysis Of Flow In The Flame Trench, Meghan Pokorski

Dissertations and Theses

We present here a methodology for using the commercial software ANSYSFLUENT to predict the acoustic field associated with Space-Launch System (SLS). We consider a two-dimensional model of flame deflector, and flame trench. The ANSYS code is then used to simulate the internal flow. Both the steady state case is considered along with other cases where the inflow has a harmonic component. A Ffowcs-Williams Hawking (FWH) surface is then constructed within the computational domain to use the computed flow fluctuations to obtain the acoustic field. The acoustic data was then compared to the experimental data.

When using the ANSYS code for ...


Improved Modeling Of Atmospheric Entry For Meteors With Nose Radii Between 5cm And 10m, Jakob Dale Brisby 2016 University of Tennessee - Knoxville

Improved Modeling Of Atmospheric Entry For Meteors With Nose Radii Between 5cm And 10m, Jakob Dale Brisby

Masters Theses

Atmospheric entry studies typically look closely at the peak heating rate that a body encounters during its trajectory. This is an extremely important phenomenon to study because it allows engineers to determine if a trajectory is possible with given materials and craft design specifications. It also allows designers to choose what type of method will be used for mitigating the enormous heat fluxes during entry. In general, it is accepted that during the super-sonic flight regime the body will continue to be heated and an ablative heat shield often is used to deal with these heating processes. The theory outlined ...


High Power Rocket Design Report, Laura E. Calcara, Monica Fernandez, Chris Green, Trent Hosokawa 2016 Loyola Marymount University

High Power Rocket Design Report, Laura E. Calcara, Monica Fernandez, Chris Green, Trent Hosokawa

Honors Thesis

Highpower rockets are extremely sensitive systems that require precise planning, testing, and analysis in order to yield accurate results. Under the guidance of project advisor, Dan Larson, a highpower rocket was designed and built to reach an apogee of 3000 feet. Additionally, means of dual deployment was used in order to aid in the safe descent and recovery of the rocket. In order to meet this expectation, two parachutes were used in conjunction with black powder ejection charges. Compliance with the safety standards of NAR and NFPA was met for the ejection system used in dual deployment. To ensure that ...


Consideration Of Microwave Power Receiving By Uas Systems, Wilson Lysford, Alexander Holland, Jens Pearson, Jeremy Straub, Scott Kerlin 2016 Selected Works

Consideration Of Microwave Power Receiving By Uas Systems, Wilson Lysford, Alexander Holland, Jens Pearson, Jeremy Straub, Scott Kerlin

Jeremy Straub

With orbital wireless power transmission a distinct future possibility, the consideration and evaluation of possible practical uses becomes very important. While there are many prospective uses for this technology the main focus of this posters is on power transmission in support of Unmanned Aerial Vehicles (UAVs).

UAVs have many functional uses in both the military sector and the private sector. These UAV’s are able to access places where humans cannot get to easily and perform jobs that may be dangerous or otherwise not advantageous for humans to perform. However a key limitation impairs the utility of the electric powered ...


The Design Of A Racing Simulator: A Three-Phase User Testing Approach, Jakob E. Rouleau, Eric J. Wach 2016 Embry-Riddle Aeronautical University

The Design Of A Racing Simulator: A Three-Phase User Testing Approach, Jakob E. Rouleau, Eric J. Wach

Human Factors and Applied Psychology Student Conference

No abstract provided.


Early Afternoon Concurrent Panel Sessions: Commercial Space Industry Snapshot: Presentation: Small Catapult-Assisted Horizontal-Launch Reusable Rbcc Ssto Spaceplane For Economical Short-Duration Leo Access, Nihad E. Daidzic, 2016 AAR Aerospace Consulting, LLC

Early Afternoon Concurrent Panel Sessions: Commercial Space Industry Snapshot: Presentation: Small Catapult-Assisted Horizontal-Launch Reusable Rbcc Ssto Spaceplane For Economical Short-Duration Leo Access, Nihad E. Daidzic,

Aviation / Aeronautics / Aerospace International Research Conference

This article discusses the conceptual design, flight trajectory calculations, and utilization of the possible future horizontally-launched reusable Single-Stage-to-Orbit (SSTO) spaceplane for small payload short-duration manned/unmanned access to Low-Earth-Orbit (LEO). The 10,000 lb spaceplane would use 5,000 ft catapult-assist horizontal-launch facility and conduct powered approach and landing on conventional horizontal paved runways following the gliding atmospheric re-entry. To increase the economy of operation, the launch facility located at high elevations (4,000+ ft) equatorial region is required, such as, the plateaus in Kenya and Tanzania in Africa and/or Ecuador in South America. A 500-lb payload, including pilot-commander ...


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